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In this question, a letter series is given where some of the letters are missing. The missing letters are given in the order as one of the options below it.
Choose the correct option. a ________ c ________ ba ________ ca ________ cb
This question is solved by hit and trial method.
We can put the four letters present in the four options in four different blanks and check which option gives a logical answer.
The correct answer choice is option D.
This is because upon putting the letters present in option D, in the blank, the sequence is: a(b)c(c)ba(b)ca(a)cb
Each triplet has each of the three letters a,b and c.
So, option D is the correct answer.